document.addEventListener('DOMContentLoaded', function() {
    const questions = [
        {
            question: "What is the width of the deck (left to right)?",
            type: "number",
            key: "width"
        },
        {
            question: "What is the depth of the deck (distance from the house outward)?",
            type: "number",
            key: "depth"
        },
        {
            question: "Is the deck a simple rectangle, or does it have angles/irregularities?",
            type: "select",
            options: ["Simple rectangle", "Angles/irregularities"],
            key: "shape"
        },
        {
            question: "Is the deck tying into the house with a ledger?",
            type: "yesno",
            key: "hasLedger"
        },
        {
            question: "Will deck boards run parallel or perpendicular to the house?",
            type: "select",
            options: ["Parallel", "Perpendicular"],
            key: "boardOrientation"
        },
        {
            question: "Are we picture framing the deck?",
            type: "yesno",
            key: "hasPictureFrame",
            followups: [
                {
                    question: "What color is the picture frame?",
                    type: "select",
                    options: ["Black", "White", "Gray", "Brown", "Custom"],
                    key: "frameColor"
                },
                {
                    question: "What color is the field decking?",
                    type: "select",
                    options: ["Black", "White", "Gray", "Brown", "Custom"],
                    key: "fieldColor"
                }
            ]
        },
        {
            question: "Are there steps?",
            type: "yesno",
            key: "hasSteps",
            followups: [
                {
                    question: "How many sets of steps?",
                    type: "number",
                    key: "stepSets"
                },
                {
                    question: "What is the width of each step run?",
                    type: "number",
                    key: "stepWidth"
                },
                {
                    question: "What is the deck height off the ground?",
                    type: "number",
                    key: "deckHeight"
                },
                {
                    question: "Is there a landing?",
                    type: "yesno",
                    key: "hasLanding",
                    followups: [
                        {
                            question: "What size is the landing?",
                            type: "text",
                            key: "landingSize"
                        }
                    ]
                }
            ]
        },
        {
            question: "Are we installing railing on the deck?",
            type: "yesno",
            key: "hasRailing",
            followups: [
                {
                    question: "Which sides of the deck will have railing? (Select all that apply)",
                    type: "multiselect",
                    options: ["Front", "Left", "Right", "Back"],
                    key: "railingSides"
                }
            ]
        },
        {
            question: "Do we need ADA handrail?",
            type: "yesno",
            key: "hasAdaRail",
            followups: [
                {
                    question: "Choose ADA handrail length",
                    type: "select",
                    options: ["8'8\"", "16'"],
                    key: "adaRailLength"
                }
            ]
        },
        {
            question: "Will the deck be skirted?",
            type: "yesno",
            key: "hasSkirting"
        },
        {
            question: "Are we installing fascia?",
            type: "yesno",
            key: "hasFascia",
            followups: [
                {
                    question: "What color is the fascia?",
                    type: "select",
                    options: ["Black", "White", "Gray", "Brown", "Custom"],
                    key: "fasciaColor"
                }
            ]
        },
        {
            question: "Any customer preferences, township requirements, or special framing considerations?",
            type: "textarea",
            key: "notes"
        }
    ];

    let currentQuestion = 0;
    let answers = {};
    const questionContainer = document.getElementById('current-question');
    const answerInput = document.getElementById('answer-input');
    const nextBtn = document.getElementById('next-btn');

    function renderQuestion(index) {
        const q = questions[index];
        questionContainer.textContent = q.question;
        answerInput.innerHTML = '';

        switch(q.type) {
            case 'number':
                answerInput.innerHTML = `
                    <input type="number" class="w-full px-4 py-2 border border-gray-300 rounded-lg" 
                           id="answer" placeholder="Enter measurement in feet">
                `;
                break;
            case 'yesno':
                answerInput.innerHTML = `
                    <div class="flex space-x-4">
                        <button type="button" class="yesno-btn px-4 py-2 border border-gray-300 rounded-lg hover:bg-gray-100" data-value="yes">Yes</button>
                        <button type="button" class="yesno-btn px-4 py-2 border border-gray-300 rounded-lg hover:bg-gray-100" data-value="no">No</button>
                    </div>
                `;
                // Add click handlers for yes/no buttons
                document.querySelectorAll('.yesno-btn').forEach(btn => {
                    btn.addEventListener('click', function() {
                        document.querySelectorAll('.yesno-btn').forEach(b => b.classList.remove('bg-blue-500', 'text-white', 'border-blue-500'));
                        this.classList.add('bg-blue-500', 'text-white', 'border-blue-500');
                    });
                });
break;
            case 'select':
                answerInput.innerHTML = `
                    <select class="w-full px-4 py-2 border border-gray-300 rounded-lg" id="answer">
                        ${q.options.map(opt => `<option value="${opt}">${opt}</option>`).join('')}
                    </select>
                `;
                break;
            case 'multiselect':
                answerInput.innerHTML = `
                    <div class="space-y-2">
                        ${q.options.map(opt => `
                            <label class="flex items-center">
                                <input type="checkbox" class="mr-2" value="${opt}">
                                ${opt}
                            </label>
                        `).join('')}
                    </div>
                `;
                break;
            case 'textarea':
                answerInput.innerHTML = `
                    <textarea class="w-full px-4 py-2 border border-gray-300 rounded-lg" 
                              id="answer" rows="3"></textarea>
                `;
                break;
        }
    }
    function collectAnswer() {
        const q = questions[currentQuestion];
        let answer;

        switch(q.type) {
            case 'number':
                answer = parseFloat(document.getElementById('answer').value) || 0;
                break;
            case 'select':
            case 'textarea':
                answer = document.getElementById('answer').value;
                break;
            case 'yesno':
                const selectedBtn = document.querySelector('.yesno-btn.bg-blue-500');
                answer = selectedBtn ? selectedBtn.dataset.value : null;
                break;
            case 'multiselect':
                answer = Array.from(document.querySelectorAll('input[type="checkbox"]:checked'))
                    .map(cb => cb.value);
                break;
        }
        
        // Skip validation for notes question (it's optional)
        if (q.key === 'notes') {
            answers[q.key] = answer || '';
            return true;
        }

        // Validate other questions
        if (answer === null || answer === undefined || (Array.isArray(answer) && answer.length === 0)) {
            return false;
        }

        // Store answer
        answers[q.key] = answer;
        return true;
    }
nextBtn.addEventListener('click', function() {
        if (!collectAnswer()) {
            alert('Please provide an answer before continuing');
            return;
        }
currentQuestion++;
        if (currentQuestion < questions.length) {
            renderQuestion(currentQuestion);
        } else {
            // All questions answered - show material list section
            document.getElementById('question-container').classList.add('hidden');
            document.getElementById('results-section').classList.remove('hidden');
}
    });
    // Initialize first question
    renderQuestion(0);

    // Show stairs details if checkbox is checked on load
    if (document.getElementById('stairs').checked) {
        document.getElementById('stairs-details').classList.remove('hidden');
    }
// Toggle stairs details
    document.getElementById('stairs').addEventListener('change', function() {
        document.getElementById('stairs-details').classList.toggle('hidden', !this.checked);
    });

    // Toggle railing details
    document.getElementById('railing').addEventListener('change', function() {
        // Add any railing-specific toggle logic here
    });
    // Handle calculate button click
    document.getElementById('calculate-btn').addEventListener('click', function() {
        // First make sure all questions are answered
        while (currentQuestion < questions.length) {
            if (!collectAnswer()) {
                alert('Please answer all questions before calculating materials');
                document.getElementById('question-container').classList.remove('hidden');
                document.getElementById('results-section').classList.add('hidden');
                renderQuestion(currentQuestion);
                return;
            }
            currentQuestion++;
        }

        // Generate and show results
        generateMaterialList();
        document.getElementById('question-container').classList.add('hidden');
        document.getElementById('results-section').classList.remove('hidden');
        document.getElementById('results-section').scrollIntoView({ behavior: 'smooth' });
        
        // Reset for next calculation
        currentQuestion = 0;
        answers = {};
        renderQuestion(0);
        
        // Log answers for debugging
        console.log('User answers:', answers);
    });
function generateMaterialList() {
        // Get basic deck dimensions
        const width = answers.width || 10; // Default to 10ft if not provided
        const depth = answers.depth || 10; // Default to 10ft if not provided
        const deckArea = width * depth;
        
        // Get special features
        const boardType = document.getElementById('board-type').value;
        const hasStairs = document.getElementById('stairs').checked;
        const stepCount = parseInt(document.getElementById('step-count').value) || 0;
        const hasRailing = document.getElementById('railing').checked;
        const hasRoof = document.getElementById('roof').checked;

        // Calculate deck boards based on board type and dimensions
        const boardWidth = 5.5; // inches
        const boardSpacing = 0.25; // inches
        const effectiveWidth = boardWidth + boardSpacing;
        
        // Calculate number of boards needed along depth
        const boardsAlongDepth = Math.ceil((depth * 12) / effectiveWidth);
        
        // Calculate board lengths needed based on width
        let deckBoards;
        if (boardType === 'trex-grooved') {
            // Trex grooved comes in 12', 16', 20' lengths - optimize for least waste
            deckBoards = calculateOptimalBoards(width, boardsAlongDepth, [12, 16, 20]);
        } else if (boardType === 'trex-square') {
            // Trex square only in 20'
            deckBoards = calculateOptimalBoards(width, boardsAlongDepth, [20]);
        } else {
            // Wood/other composite - assume 12' boards
            deckBoards = calculateOptimalBoards(width, boardsAlongDepth, [12]);
        }

        // Calculate framing materials
        const joistSpacing = 16; // inches
        const joists = Math.ceil((width * 12) / joistSpacing) + 1; // +1 for rim joist
        const beams = Math.ceil(width / 8);
        const posts = Math.ceil(width / 6) * 2; // Posts on both sides
        const concrete = posts * 3; // 3 bags per post

        // Calculate fasteners
        const screwSpacing = 12; // inches along board length
        const screwsPerBoard = Math.ceil((depth * 12) / screwSpacing) * 2; // 2 screws per joist
        const totalScrews = screwsPerBoard * boardsAlongDepth;
        const fastenerBoxes = Math.ceil(totalScrews / 250); // 250 screws per box
        
        // Update results display
        document.getElementById('deck-boards').textContent = `${deckBoards.total} ${boardType.includes('trex') ? 'Trex' : boardType === 'wood' ? 'Wood' : 'Composite'} boards`;
        document.getElementById('joists').textContent = `${joists} (2×8 @ 16" OC)`;
        document.getElementById('beams').textContent = `${beams} (4×6)`;
        document.getElementById('posts').textContent = `${posts} (6×6)`;
        document.getElementById('concrete').textContent = `${concrete} bags`;
        document.getElementById('fasteners').textContent = `${fastenerBoxes} boxes`;

        // Add special features if checked
        if (hasStairs) {
            document.getElementById('deck-boards').textContent += ` + ${stepCount} stair treads`;
            document.getElementById('joists').textContent += ` + ${stepCount} stair stringers`;
        }
        if (hasRailing) {
            const railingLength = width * 2; // Assuming 2 sides
            const railingPosts = Math.ceil(railingLength / 6) * 2; // 6' max spacing, 2 per section
            document.getElementById('deck-boards').textContent += ` + ${Math.ceil(railingLength / 6)} railing sections`;
            document.getElementById('posts').textContent += ` + ${railingPosts} railing posts`;
        }
        if (hasRoof) {
            document.getElementById('joists').textContent += ` + ${Math.ceil(width / 2)} roof rafters`;
            document.getElementById('posts').textContent += ` + ${Math.ceil(width / 8) * 2} roof support posts`;
        }
    }

    function calculateOptimalBoards(width, count, availableLengths) {
        availableLengths.sort((a, b) => b - a); // Sort descending
        
        const result = {
            total: 0,
            lengths: {}
        };
        
        for (let i = 0; i < count; i++) {
            let remaining = width;
            let currentCut = {};
            
            while (remaining > 0) {
                for (const len of availableLengths) {
                    if (len <= remaining) {
                        currentCut[len] = (currentCut[len] || 0) + 1;
                        remaining -= len;
                        break;
                    }
                }
            }
            
            // Aggregate the lengths
            for (const [len, qty] of Object.entries(currentCut)) {
                result.lengths[len] = (result.lengths[len] || 0) + qty;
                result.total += qty;
            }
        }
        
        return result;
    }
});